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      https://www.ias.ac.in/article/fulltext/boms/043/0067

    • Keywords

       

      Hydrothermal process; sol–gel; SiO$_2$–TiO$_2$; porous materials.

    • Abstract

       

      An experimental strategy was developed to obtain (Si$_{1−x}$Ti$_x$ )O$_2$ ($x \leq 0.25$) porous materials via the sol–gel hydrothermal process. The sol was prepared from Si(OEt)$_4$ (TEOS), Ti(OBu)$_4$ (OBu: OCH$_2$CH$_2$CH$_2$CH$_3$), anhydrous ethanol, deionized water and nitric acid. The reagents were mixed at room temperature (293 K) to obtain a homogeneous colourless liquid which was subjected to a hydrothermal process at 473 K using a stainless steel container. Finally, the material obtained was treated at 873 K in air. The surface area of the treated solids was determined by N$_2$ adsorption/desorption isotherms. The corresponding average pore diameter was evaluated using the Barret, Joiner and Halenda and Horváth-Kawazoe methods. Porous structures were obtained, in which the average pore diameter of the microporous ones was 1.4 nm. The characterization techniques employed were Fourier transform infrared spectroscopy (FTIR), X-ray diffraction, Raman spectroscopy, scanning electron microscopy, thermal gravimetric analysis, differential scanning calorimetry and UV–Vis diffuse reflectance spectroscopy. The Si–O–Ti bonds were detected by FTIR.

    • Author Affiliations

       

      ROBERTO MENDOZA-SERNA1 JOSÉ OCOTLÁN FLORES-FLORES2 MARINA CABALLERO-DÍAZ1 ATENEA JOSEFINA CHONG-SANTIAGO1 LUCILA VALDEZ-CASTRO3 ROBERTO YSACC SATO-BERRÚ2

      1. Carrera de Ingeniería Química, Unidad Multidisciplinaria de Investigación Experimental Zaragoza (UMIEZ), Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, CD de México 09230, México
      2. Departamento de Micro y Nanotecnologías, Instituto de Ciencias Aplicadas y Tecnología (ICAT), Universidad Nacional Autónoma de México, CD de México 04510, México
      3. Departamento de Ingeniería en Biotecnología, Universidad Politécnica de Puebla, Puebla 72640, México
    • Dates

       
  • Bulletin of Materials Science | News

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